[Users] Error - Unknown calendar component type

[Keith Edmunds]

Occasionally I receive a reply proposing a different time for a meeting in
the form of an ical attachment, in this particular case generated by
Microsoft Exchange. The vCalendar plugin (Version: 3.17.6git66) doesn't
understand that ical attachment and just shows "Error - Unknown calendar
component type".

Is this a known problem with the vCalendar plugin?

In case it's helpful, this is the format of the ical file for proposing a
change (with some minor redaction; happy to make the unredacted version
available if required).

BEGIN:VCALENDAR
METHOD:COUNTER
PRODID:Microsoft Exchange Server 2010
VERSION:2.0
BEGIN:VTIMEZONE
TZID:GMT Standard Time
BEGIN:STANDARD
DTSTART:16010101T020000
TZOFFSETFROM:+0100
TZOFFSETTO:+0000
RRULE:FREQ=YEARLY;INTERVAL=1;BYDAY=-1SU;BYMONTH=10
END:STANDARD
BEGIN:DAYLIGHT
DTSTART:16010101T010000
TZOFFSETFROM:+0000
TZOFFSETTO:+0100
RRULE:FREQ=YEARLY;INTERVAL=1;BYDAY=-1SU;BYMONTH=3
END:DAYLIGHT
END:VTIMEZONE
BEGIN:VEVENT
ATTENDEE;PARTSTAT=TENTATIVE;CN=redacted:mailto:[redacted at example.com]
DTSTART;TZID=GMT Standard Time:20200915T153000
DTEND;TZID=GMT Standard Time:20200915T155000
X-MS-OLK-ORIGINALSTART;TZID=GMT Standard Time:20200915T120000
X-MS-OLK-ORIGINALEND;TZID=GMT Standard Time:20200915T122000
SUMMARY;LANGUAGE=en-US:New Time Proposed: Invitation: redacted
LOCATION;LANGUAGE=en-US:https://zoom.us/[redacted]
UID:[redacted]@google.com
SEQUENCE:0
DTSTAMP:20200910T143217Z
COMMENT;LANGUAGE=en-US:\n
END:VEVENT
END:VCALENDAR

Thanks,
Keith
-- 
"The great enemy of communication is the illusion of it" - William Whyte,